SiCp/2024Al铝基复合材料搅拌摩擦焊接头微观组织

摘要

SiCp/2024Al aluminum matrix composites were welded by Friction Stir Welding.The teleport move behavior of the base metal was analyzed by use of the ' emergent stop' experiment.The joint structure was observed by metallographic microscope and SEM.The microstructure analysis indicated that V style structure was found in the brazing joint.And SiC particles distributed unevenly in different parts of the welding joints.SiC particles presented segregation phenomenon in the SMAZ,SiC particles were less in the centre of the welding joints.The reinforcement particles might disappear if the welding parameters were inappropriate.The TEM analysis of different parts of the welding joint showed that SiC/Al interface was bounded clearly,no brittle phase formed,and the crushed SiC particles were found.%利用搅拌摩擦焊对SiCp/2024Al铝基复合材料进行了焊接.采用急停实验分析母材瞬间移动行为.利用金相显微镜,TEM观察接头组织.接头显微组织分析表明,接头中形成V字型结构,且SiC颗粒因焊缝位置不同而分布不均匀.在热机影响区中,SiC出现偏析;在焊核区,SiC颗粒较少.若参数选择不当,焊核中心区出现了颗粒消失现象.焊缝不同位置透射电镜分析表明,SiC/Al界面结合清晰,无脆性相生成,并在其中发现了破碎的SiC颗粒.